It was either SNL or MadTV that did this from the point of view of the sperm; they were Marines invading. And they encountered another battalion. And they eventually figured out they were NOT in the same army.
The Fox version says it's "so rare," but when you click through to the Sky news version you get this:
"And while it sounds rare, recent research indicates that one in 12 non-identical twins are so-called bi-paternal, with a rise in fertility treatment and changing sexual behaviour being blamed."
"And while it sounds rare, recent research indicates that one in 12 non-identical twins are so-called bi-paternal, with a rise in fertility treatment and changing sexual behaviour being blamed."
@persimmon: Estimates on single-birth paternity fraud are around 10%--in 10% of births, the assumed father is not the biological father. There's no reason that should differ drastically in fraternal twins.
Fraternal twins occur in ever 12 in 1000 births, so every 1 in 1000 births resulted in fraternal twins that are really half siblings. If I used the birth rate correctly, this event happens 11 times daily.
I'm more inclined to believe this SciAm article than the crappy Sky News one I quoted below. The idea of "changing sexual behaviour" is so vague and unscientific. There's always been as much infidelity as there is now, and I'm willing to bet the phenomenon of fraternal twins who have different fathers has historically been less rare than assumed.
So are the twins the same age? Did she have sex with her partner and some other guy within hours of each other? I'm not judging, just trying to figure out the mechanics of this one, you know, just in case...
@ae38: It can take up to 24 hours for a sperm to implant itself in an egg, following sex, so there was definitely plenty of time for each egg to be fertilized and be implanted.
@Steve Holt's Mother Part Deux: @ObamaIsMyPresident: I have friends who were on that show. I will ask them about this, though I wouldn't be surprised at all. This sounds like a perfect GL story line.
I'm glad at least that reputable scientists have differentiated "heteropaternal" conception from that other kind. Those people will be wanting rights someday!
05/19/09
05/19/09
"And while it sounds rare, recent research indicates that one in 12 non-identical twins are so-called bi-paternal, with a rise in fertility treatment and changing sexual behaviour being blamed."
Which is mind boggling.
05/18/09
[news.sky.com]
05/19/09
Fraternal twins occur in ever 12 in 1000 births, so every 1 in 1000 births resulted in fraternal twins that are really half siblings. If I used the birth rate correctly, this event happens 11 times daily.
05/19/09
05/18/09
See Page 2 paragraph 1.
I guess the second guy's squeegee head didn't work. Singular paternity fail.
05/18/09
I'm more inclined to believe this SciAm article than the crappy Sky News one I quoted below. The idea of "changing sexual behaviour" is so vague and unscientific. There's always been as much infidelity as there is now, and I'm willing to bet the phenomenon of fraternal twins who have different fathers has historically been less rare than assumed.
05/18/09
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05/18/09
I'm glad at least that reputable scientists have differentiated "heteropaternal" conception from that other kind. Those people will be wanting rights someday!
05/18/09
05/18/09
05/18/09